Abstract:
The study of baryonic decay mode Λ b → Λ` + ` − is of interest in relation to the recent
flavor anomalies. Based on the SM of particle physics, we study the decay in light of the
available inputs from lattice and the data from LHCb. We fit the form-factors of this
decay mode using the available theory and experimental inputs after defining different fit
scenarios and checking their consistencies. Utilizing the fit results, we have predicted a
few observables and lepton universality testing R Λ related to the decay. This decay with a
polarized Λ b offers a plethora of observables that are suitable to discriminate New Physics
from the Standard Model. We study the angular analysis of the decay for SM operator
basis with its chirality flipped counterparts, and new scalar and pseudo-scalar operators,
retaining the mass of the final state leptons. At the low hadronic recoil, we use the HQET
framework to relate the hadronic form factors which lead to simplified expression of the
angular observables where short- and long-distance physics factorize. Using the factorized
expressions of the observables, we construct a number of tests of short-and long-distance
physics including null tests of the SM and its chirality flipped counterparts that can be
carried out using experimental data.
